As a counter-anecdote, I use YouTube daily in Safari and it will not infrequently hang for tens of seconds when trying to load a video, occasionally play the sound without the video, reasonably frequently put the video over most of the page with no way to get to the controls, etc.
(This may be because I have a whole swathe of adblockers, etc., plus I do a lot of `yt-dlp`ing from the same IP which may have me on a naughty list.)
(This may be because I have a whole swathe of adblockers, etc., plus I do a lot of `yt-dlp`ing from the same IP which may have me on a naughty list.)